trigonometrical measurements at Spitzbergen. 
297 
A. M. P. M. 
Mr. Daniell 
— Aw- 
Newman’s. 
. 30.188 
\ 
Jones’s. 
30.192 
r~ • J '- 
Newman’s. 
30.no 
Jones’s. 
30.120 
Mr. Newman 
04 
O 
OO 
00 
30.200 
30.106 
30.X19 
Mr. Jones . 
. 30.182 
30.192 
30.116 
30.120 
Captain Sabine 
30.180 
30.191 
30.103 
30.122 
Mean , 
. 30.1845 
30.1937 
30.1087 
30.1202 
Capacity . . 
J 
b 
0 
04 ' 
VO 
— .0187 
0 
0 
f 
—.0254 
Capillary action 
+.0880 
+.0280 
+ .0880 
+.0280 
30.2686 30.2030 30.1915 30.1228 
v > v _ ) 
\r ~v 
Differences ; Jones’s less .0656. .0687. 
< » 
Mean .067 
The cause of the difference of .067 parts of an inch in the 
indications of the two barometers did not appear obvious, 
either to Mr. Newman or to Mr. Jones ; and though its 
occurrence was not quite so satisfactory as a perfect, or even 
as a nearer accordance might have been, it was no otherwise 
important than as it made an index correction of .067 neces- 
sary to be applied, additive to Mr. Jones’s or subtractive to 
Mr. Newman’s, to cause the height of the one to be inferred 
from that of the other. 
On my arrival in Norway in June, I was surprised and 
mortified to perceive, that, after so much pains had been be- 
stowed, a greater difference obtained in the indications of the 
barometers than in the former comparison ; on a close ex- 
amination, a small quantity of mercury was discovered to 
have lodged between the cistern of Mr. Jones’s and its brass 
enclosure, which I at first concluded had escaped from the 
cistern ; no leak was however perceptible, and the cistern and 
tube, as well as every other part of the barometer were 
mdccccxxiv. Q q 
